Business Restructuring (Additional Information) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Restructuring Cost and Reserve [Line Items]
Business restructuring	$ 0	$ 12,000,000	$ 208,000,000
Severance and other costs			160,000,000
Asset write-offs			53,000,000
Pension curtailments			5,000,000
Costs associated with restructuring actions for demolition, dismantling, relocation and training			5,000,000
Restructuring reserve	50,000,000
Payments for restructuring	23,000,000		7,000,000
Restructuring Reserve, Accrual Adjustment		12,000,000
Number Of Employees Impacted	323	273
Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			$ 2,000,000